<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <!--[if lte IE 8]> <script src="js/html5shiv.min.js"></script> <![endif]-->
    <style>
        header{
            width: 300px;
            height: 300px;
            background-color: aqua;
        }
    </style>
</head>
<body>
    <header>
      <form action="" id="vvi">
        <input type="tel" required name="useName" placeholder="请输入" autofocus autocomplete="on">
        <input type="email" name="email" required>
        <input type="datetime-local">
    <input type="submit">
      </form>
      <input type="text" required form="vvi">
    </header>
</body>
</html>